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What is the typical amperage rating of a PDU used in a network server rack

Rack PDUs commonly have amperage ratings of 15A, 20A, 30A, or higher, depending on single-phase or three-phase configurations and load requirements.Standard Amperage Ratings

In North America, typical single-phase PDUs are rated at 15A, 20A, or 30A, with the recommended continuous load limited to 80% of the rated amperage to comply with electrical codes and prevent overloading. For example, a 20A PDU should not carry more than 16A continuously, and a 30A PDU should not exceed 24A under normal operation . For three-phase PDUs, amperage ratings are often higher, such as 30A, 50A, or more, depending on the rack's power requirements and the PDU design. Three-phase PDUs distribute the load across multiple phases, allowing higher total power delivery while keeping per-phase current within safe limits .

Factors Affecting PDU Amperage
  • Input plug or hardwired connection: The PDU's maximum amperage is determined by the wall plug or hardwired input, which can vary by region and electrical code .
  • Internal circuit breakers: Many PDUs have internal breakers rated for 16A–20A per bank, which may limit the usable amperage even if the input cord supports higher current .
  • Derating for continuous load: UL and other standards often require PDUs to operate at 80% of their maximum rating for continuous loads, providing headroom for transient spikes .
Common PDU Examples
  • APC AP8861: 20A, suitable for standard server racks .
  • APC AP8941: 30A, often used for network equipment or higher-density racks .
  • High-density three-phase PDUs: Can support 50A or more, distributing power across three phases for enterprise data centers .
Summary

The typical amperage rating of a rack PDU depends on the voltage, phase configuration, and intended load. For most North American server racks, single-phase PDUs range from 15A to 30A, while three-phase PDUs can range from 30A to 50A or higher. Always consider derating for continuous load and verify internal breaker limits to ensure safe and reliable operation .

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Technical note

This reference is intended for preliminary specialty-cable research. Compatibility, link budgets, fire performance, installation methods, test limits and applicable standards must be verified for the specific project.

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